zspr (l)  Linux Man Pages
zspr: performs the symmetric rank 1 operation A := alpha*x*conjg( xaq ) + A,
Command to display zspr
manual in Linux: $ man l zspr
NAME
ZSPR  performs the symmetric rank 1 operation A := alpha*x*conjg( xaq ) + A,
SYNOPSIS
 SUBROUTINE ZSPR(

UPLO, N, ALPHA, X, INCX, AP )

CHARACTER
UPLO

INTEGER
INCX, N

COMPLEX*16
ALPHA

COMPLEX*16
AP( * ), X( * )
PURPOSE
ZSPR performs the symmetric rank 1 operation
where alpha is a complex scalar, x is an n element vector and A is an
n by n symmetric matrix, supplied in packed form.
ARGUMENTS
 UPLO (input) CHARACTER*1

On entry, UPLO specifies whether the upper or lower
triangular part of the matrix A is supplied in the packed
array AP as follows:
UPLO = aqUaq or aquaq The upper triangular part of A is
supplied in AP.
UPLO = aqLaq or aqlaq The lower triangular part of A is
supplied in AP.
Unchanged on exit.
 N (input) INTEGER

On entry, N specifies the order of the matrix A.
N must be at least zero.
Unchanged on exit.
 ALPHA (input) COMPLEX*16

On entry, ALPHA specifies the scalar alpha.
Unchanged on exit.
 X (input) COMPLEX*16 array, dimension at least

( 1 + ( N  1 )*abs( INCX ) ).
Before entry, the incremented array X must contain the N
element vector x.
Unchanged on exit.
 INCX (input) INTEGER

On entry, INCX specifies the increment for the elements of
X. INCX must not be zero.
Unchanged on exit.
 AP (input/output) COMPLEX*16 array, dimension at least

( ( N*( N + 1 ) )/2 ).
Before entry, with UPLO = aqUaq or aquaq, the array AP must
contain the upper triangular part of the symmetric matrix
packed sequentially, column by column, so that AP( 1 )
contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 1, 2 )
and a( 2, 2 ) respectively, and so on. On exit, the array
AP is overwritten by the upper triangular part of the
updated matrix.
Before entry, with UPLO = aqLaq or aqlaq, the array AP must
contain the lower triangular part of the symmetric matrix
packed sequentially, column by column, so that AP( 1 )
contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 2, 1 )
and a( 3, 1 ) respectively, and so on. On exit, the array
AP is overwritten by the lower triangular part of the
updated matrix.
Note that the imaginary parts of the diagonal elements need
not be set, they are assumed to be zero, and on exit they
are set to zero.
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